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Commit deedabb2 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

s390/kvm: set guest page states to stable on re-ipl 



The guest page state needs to be reset to stable for all pages
on initial program load via diagnose 0x308.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent b31288fa

arch/s390/include/asm/pgalloc.h

+1 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ unsigned long *page_table_alloc(struct mm_struct *, unsigned long); 
void page_table_free(struct mm_struct *, unsigned long *);

void page_table_free_rcu(struct mmu_gather *, unsigned long *);



void page_table_reset_pgste(struct mm_struct *, unsigned long, unsigned long);

int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,

			  unsigned long key, bool nq);

arch/s390/kvm/diag.c

+3 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 


#include <linux/kvm.h>

#include <linux/kvm_host.h>

#include <asm/pgalloc.h>

#include <asm/virtio-ccw.h>

#include "kvm-s390.h"

#include "trace.h"
@@ -86,9 +87,11 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu) 
	switch (subcode) {

	case 3:

		vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;

		page_table_reset_pgste(current->mm, 0, TASK_SIZE);

		break;

	case 4:

		vcpu->run->s390_reset_flags = 0;

		page_table_reset_pgste(current->mm, 0, TASK_SIZE);

		break;

	default:

		return -EOPNOTSUPP;

arch/s390/mm/pgtable.c

+72 −0
Original line number Diff line number Diff line
@@ -879,6 +879,78 @@ static inline void page_table_free_pgste(unsigned long *table) 
	__free_page(page);

}



static inline unsigned long page_table_reset_pte(struct mm_struct *mm,

			pmd_t *pmd, unsigned long addr, unsigned long end)

{

	pte_t *start_pte, *pte;

	spinlock_t *ptl;

	pgste_t pgste;



	start_pte = pte_offset_map_lock(mm, pmd, addr, &ptl);

	pte = start_pte;

	do {

		pgste = pgste_get_lock(pte);

		pgste_val(pgste) &= ~_PGSTE_GPS_USAGE_MASK;

		pgste_set_unlock(pte, pgste);

	} while (pte++, addr += PAGE_SIZE, addr != end);

	pte_unmap_unlock(start_pte, ptl);



	return addr;

}



static inline unsigned long page_table_reset_pmd(struct mm_struct *mm,

			pud_t *pud, unsigned long addr, unsigned long end)

{

	unsigned long next;

	pmd_t *pmd;



	pmd = pmd_offset(pud, addr);

	do {

		next = pmd_addr_end(addr, end);

		if (pmd_none_or_clear_bad(pmd))

			continue;

		next = page_table_reset_pte(mm, pmd, addr, next);

	} while (pmd++, addr = next, addr != end);



	return addr;

}



static inline unsigned long page_table_reset_pud(struct mm_struct *mm,

			pgd_t *pgd, unsigned long addr, unsigned long end)

{

	unsigned long next;

	pud_t *pud;



	pud = pud_offset(pgd, addr);

	do {

		next = pud_addr_end(addr, end);

		if (pud_none_or_clear_bad(pud))

			continue;

		next = page_table_reset_pmd(mm, pud, addr, next);

	} while (pud++, addr = next, addr != end);



	return addr;

}



void page_table_reset_pgste(struct mm_struct *mm,

			unsigned long start, unsigned long end)

{

	unsigned long addr, next;

	pgd_t *pgd;



	addr = start;

	down_read(&mm->mmap_sem);

	pgd = pgd_offset(mm, addr);

	do {

		next = pgd_addr_end(addr, end);

		if (pgd_none_or_clear_bad(pgd))

			continue;

		next = page_table_reset_pud(mm, pgd, addr, next);

	} while (pgd++, addr = next, addr != end);

	up_read(&mm->mmap_sem);

}

EXPORT_SYMBOL(page_table_reset_pgste);



int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,

			  unsigned long key, bool nq)

{